I fully agree. Some of these tautologies, RAGs or RAG adjacent ideas feel like there is real potential. I know in my own testing adding a knowledge graph provided cost saving benefits.
Ultimately, the problem is people aren't actually benchmarking any of these ideas or if they are its via an extremely misleading methodology. For example, headroom violates cache frequently, nullifying any potential savings it could have; but does their benchmarks show that? Nope. [1]
As an aside, I wonder how many days are we away from Codex or Claude taking all the "read" tool calls and re-assembling a full map of your codebase and then offering it as a feature.